__________ may serve as a molecular clock that measures the approximate time since two closely related species diverged.
A) tRNA
B) mRNA
C) rRNA
D) sRNA
E) tmRNA

Question

Quizplus · Accepted Answer

rRNA (ribosomal RNA) genes can provide a molecular clock because they evolve slowly and their sequences are conserved across different species. By comparing the differences in rRNA sequences between closely related species, scientists can estimate the approximate time since their divergence from a common ancestor. This method of estimating evolutionary time is known as molecular dating or molecular clock analysis.

__________ May Serve as a Molecular Clock That Measures the Approximate